Grafite cunducts heat by fonons( Vibrations of the whole atomic net, not only eletrons) that is why it only conducts heat well in one direction( diamonds do not have this problem because it has a proporcional unit cell).I think it would not be a good ideia to use pencil or grafite lube as thermal interface since the planes are all going to be mixed up.
Atentiously
Guilherme Cunha Prada
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